Bump ansys-sphinx-theme from 0.11.2 to 0.12.3 (#512)

Bumps [ansys-sphinx-theme](https://github.com/ansys/ansys-sphinx-theme) from 0.11.2 to 0.12.3.
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v0.11.2...v0.12.3)

---
updated-dependencies:
- dependency-name: ansys-sphinx-theme
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Paul Profizi <[email protected]>

requirements/requirements_docs.txt

@@ -11,6 +11,6 @@ pytest-sphinx==0.5.0
 sphinx-notfound-page==1.0.0
 sphinx-copybutton==0.5.0
 sphinx-gallery==0.14.0
-ansys_sphinx_theme==0.11.2
+ansys_sphinx_theme==0.12.3
 sphinx-autodoc-typehints==1.24.0
 pyvista==0.42.1